Single attosecond pulse generation from asymmetric molecules with a multicycle laser pulse

Area of Science:

• Quantum optics
• Attosecond science
• Molecular physics

Background:

• Attosecond pulse generation is crucial for ultrafast phenomena studies.
• Conventional methods often rely on few-cycle laser pulses.
• Generating single attosecond pulses with longer driving lasers remains a challenge.

Purpose of the Study:

• To propose a novel scheme for single attosecond pulse generation.
• To utilize multicycle laser pulses for attosecond pulse production.
• To explore harmonic generation in asymmetric molecules.

Main Methods:

• Theoretical proposal for attosecond pulse generation.
• Simulation of harmonic generation in asymmetric molecules.
• Utilizing multicycle laser fields.
• Spectral filtering of generated harmonics.

Main Results:

• Demonstrated generation of both even and odd harmonics.
• Attosecond pulses are produced every full laser cycle.
• Single attosecond pulses are achievable by filtering cutoff harmonics.
• The method allows for longer driving laser pulse durations.

Conclusions:

• The proposed scheme offers a new pathway for single attosecond pulse generation.
• Asymmetric molecules are effective in producing attosecond pulses with multicycle lasers.
• This method provides a longer temporal window for attosecond pulse generation.